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<p>There are several physical data centers in cloud environment with hundreds or thousands of computers. Virtualization is the key technology to make cloud computing feasible. It separates virtual machines in a way that each of these so-called virtualized machines can be configured on a number of hosts according to the type of user application. It is also possible to dynamically alter the allocated resources of a virtual machine. Different methods of energy saving in data centers can be divideddoi:10.11591/ijece.v9i1.pp554-561 fatcat:t7nwmt3k75d2hipwchcwu5z3zm